WRKY42 modulates phosphate homeostasis through regulating phosphate translocation and acquisition in Arabidopsis

Plant Physiology
Tong SuYi-Fang Chen

Abstract

The Arabidopsis (Arabidopsis thaliana) WRKY transcription factor family has more than 70 members, and some of them have been reported to play important roles in plant response to biotic and abiotic stresses. This study shows that WRKY42 regulated phosphate homeostasis in Arabidopsis. The WRKY42-overexpressing lines, similar to the phosphate1 (pho1) mutant, were more sensitive to low-inorganic phosphate (Pi) stress and had lower shoot Pi content compared with wild-type plants. The PHO1 expression was repressed in WRKY42-overexpressing lines and enhanced in the wrky42 wrky6 double mutant. The WRKY42 protein bound to the PHO1 promoter under Pi-sufficient condition, and this binding was abrogated during Pi starvation. These data indicate that WRKY42 modulated Pi translocation by regulating PHO1 expression. Furthermore, overexpression of WRKY42 increased root Pi content and Pi uptake, whereas the wrky42 mutant had lower root Pi content and Pi uptake rate compared with wild-type plants. Under Pi-sufficient condition, WRKY42 positively regulated PHOSPHATE TRANSPORTER1;1 (PHT1;1) expression by binding to the PHT1;1 promoter, and this binding was abolished by low-Pi stress. During Pi starvation, the WRKY42 protein was degraded through t...Continue Reading

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Citations

Dec 15, 2015·Journal of Experimental Botany·Xiaoyan DaiWen-Hao Zhang
Nov 19, 2015·International Journal of Molecular Sciences·Liuqiang WangCaiqiu Gao
Dec 21, 2016·Journal of Integrative Plant Biology·Jingjing JiangJianhua Zhang
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Jun 1, 2019·Plant, Cell & Environment·Yun HuangYuan-Yue Shen
Jun 25, 2019·Horticulture Research·Xian-Yan ZhaoYu-Jin Hao
May 21, 2020·Plant Biotechnology Journal·Fang WangYi-Fang Chen
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Nov 1, 2020·The Plant Journal : for Cell and Molecular Biology·Qiuju HeChuanzao Mao
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Dec 17, 2020·Journal of Integrative Plant Biology·Yi WangWei-Hua Wu
Jan 2, 2021·Plants·An Yong HuXue Qiang Zhao

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